package com.max.server.config;

import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.max.server.config.security.component.JwtTokenUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.simp.config.ChannelRegistration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.messaging.simp.stomp.StompCommand;
import org.springframework.messaging.simp.stomp.StompHeaderAccessor;
import org.springframework.messaging.support.ChannelInterceptor;
import org.springframework.messaging.support.MessageHeaderAccessor;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.web.socket.config.annotation.EnableWebSocket;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;

/**
 * WebSocket配置类
 * @author Suntingxing
 * @date 2021/10/26 23:48
 */
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {

    @Value("${jwt.tokenHead}")
    private String tokenHead;
    @Autowired
    private JwtTokenUtils jwtTokenUtil;
    @Autowired
    private UserDetailsService userDetailsService;
    /**
     * 添加这个EndPoint，这样在网页中就可以通过Websocket连接上服务
     * 也就是配置websocket的服务地址，并且可以指定是否使用socketJS
     * @param registry
     */
    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        /**
         * 1.addEndpoint:将ws/ep路径注册为stomp的端点，用户连接了这个端点就可以进行webSocket通讯，支持socketJs
         * 2.setAllowedOrigins:允许跨域
         * 3.withSocketJS():支持Socketjs访问
         */
        //registry.addEndpoint("/ws/ep").allowedOriginPatterns("*").withSockJS();
        registry.addEndpoint("/ws/ep").setAllowedOriginPatterns("*").withSockJS();
    }

    /**
     * 输入通道参数配置
     * @param registration
     */
    @Override
    public void configureClientInboundChannel(ChannelRegistration registration) {
        registration.interceptors(new ChannelInterceptor() {
            @Override
            public Message<?> preSend(Message<?> message, MessageChannel channel) {
                StompHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, StompHeaderAccessor.class);
                // 判断是否是链接，如果是就要获取Token，并且设置到用户对象中去
                if(StompCommand.CONNECT.equals(accessor.getCommand())){
                    String token = accessor.getFirstNativeHeader("Auth-Token");
                    if(!StringUtils.isEmpty(token)){
                        String authToken = token.substring(tokenHead.length());
                        String username = jwtTokenUtil.getUserNameFromToken(authToken);
                        // 用户名不为空 token中存在用户名
                        if(!StringUtils.isEmpty(username)){
                            // 登录
                            UserDetails userDetails = userDetailsService.loadUserByUsername(username);
                            // 验证token是否有效，如果有效就重新设置用户对象
                            if(jwtTokenUtil.validateToken(authToken,userDetails)){
                                UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(
                                        userDetails, null, userDetails.getAuthorities());

                                SecurityContextHolder.getContext().setAuthentication(authenticationToken);
                                accessor.setUser(authenticationToken);
                            }
                        }
                    }
                }
                return message;
            }
        });
    }

    /**
     * 配置消息代理
     * @param registry
     */
    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        // 配置代理域，可以配置多个，配置代理目的地前缀为/queue，可以在配置域上向客户端推送消息
        registry.enableSimpleBroker("/queue");
    }
}
